The Siemens Building Technology QFM2101 Sensor is a high-performance duct humidity sensor engineered for precise atmospheric monitoring in commercial HVACR systems

Maintains the original engineering specifications for refrigerant flow rates and pressure drops across the service port

and 138164J across various Daikin-McQuay air handlers

Common Questions Is the HC35CE231 compatible with older HC35CE231A models

Resideo EARD6TZ Damper 320788-702 The Siemens Building Technology QFM2101The Resideo EARD6TZ Damper is a professional grade 6 inch round fresh air damper engineered for precision airflow management in HVAC zoning systems. Designed for fresh air intake and combustion makeup air, this unit features a 24V spring return actuator that ensures fail safe operation. Built from galvanized steel, the single blade design offers quiet operation and closes tightly against a specialized gasket for minimal leakage. Contractors will